From: Maxime Devos <maximedevos@telenet.be>
To: Zelphir Kaltstahl <zelphirkaltstahl@posteo.de>
Cc: Guile User <guile-user@gnu.org>
Subject: Re: Contracts macro example
Date: Thu, 4 Aug 2022 18:19:04 +0200 [thread overview]
Message-ID: <1c7afd30-1ec6-5edb-7835-cf4cc9f70c27@telenet.be> (raw)
In-Reply-To: <4e89ed41-dcbe-a7f5-f4b3-314e325016a5@posteo.de>
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On 24-07-2022 03:21, Zelphir Kaltstahl wrote:
> ~~~~
> (define-syntax require
> (identifier-syntax
> (syntax-error "'require' can only be used as part of a contract construct")))
> ~~~~
>
> Can you explain how it works?
>
If you meant: how can identifier-syntax + syntax-error be used? -- I
don't have more information than the explanations in the manual on
identifier-syntax and syntax-error.
If you meant: how does it work? I don't know how Guile's macro system
is implemented, you'll have to look at the source code of (ice-9
psyntax), maybe read the paper it cites.
If you meant: how to use it? All you have to do is replace your (define
require ...) by the (define-syntax require ...)
Greetings,
Maxime
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prev parent reply other threads:[~2022-08-04 16:19 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-14 23:55 Contracts macro example Zelphir Kaltstahl
2022-07-19 15:20 ` Maxime Devos
2022-07-20 8:39 ` Zelphir Kaltstahl
2022-07-20 8:55 ` Maxime Devos
2022-07-24 1:21 ` Zelphir Kaltstahl
2022-08-04 16:19 ` Maxime Devos [this message]
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